Chemical weapons remain a persistent threat, but advances in protective clothing are changing the calculus of CBRN warfare. So, what we are really talking about with ‘CBRN suits’ is chemical warfare protective clothing. Chemical protective clothing and respiratory protection erodes the lethality of chemical warfare. For this reason, it is worth looking at the history of chemical protective clothing and how we got to where we are today. The logical end-state in CBRN protective clothing is a regular combat duty uniform which is, by means of its fabrics, also a chemical protective suit.